Anomalies in the Heat-Capacity Signatures of Submonolayer Adsorbates with Attractive Lateral Interactions.
STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
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The analytic closed form of the heat-capacity signatures previously derived for the McQuistan-Hock MQH model of a lattice gas is applied to a various adsorbed systems for which the lateral interaction varies from a few meV to about 300 meV. It is shown that whenever the adsorption system can be described by a two-dimensional gas on which the substrate effects are less important than the adatom-adatom interactions, the computed temperatures at which the heat-capacity signatures display their maximum are in excellent agreement with the experimental measurements. Keywords Heat capacities, Submonolayer adsorbates, Attractive lateral interactions, Anomalies, McQuistan hock model, Two dimensional lattice.